Re: KVM slow LAMP guest

[Hansa <forums@logic-q.nl>]

On 26-8-2015 0:33, Wanpeng Li wrote:
>> On the VM server I issued the command below every eleven minutes:
>>
>> date >>  curltest-file; _
>> top -b -n 1 | sed -n '7,12p' >> curltest-file; _
>> curl -o /dev/null -s -w"time_total: %{time_total}\\n" https://my.domain.com | perl -pe 'BEGIN {use POSIX;} print strftime("%Y-%m-%d %H:%M:%S ", localtime)' >> curltest-file
>>
>> This gives me the total time for displaying my site on a local machine. It also includes a 'top' command to display which processes are running at each sample. All is saved in a file called curltest-file.
>>
>> I found 7 occurrences in my curltest-file of a time_total larger than 20 seconds. Top however didn't show any significant CPU or IO activity at those sampled times. Further investigations shows me that they are related to a known (gravatar)  issue in the Wordpress Jetpack plugin. I didn't include these samples in the average total.
>
> If you just use halt_poll_ns or both halt_poll_ns and idle=poll in guest?
>
I just use kvm.halt_poll_ns=500000
Should I try some different tests?